this study investigates removing ash and pyrite sulphur from bitumen by column flotation process. central composite design (ccd) of response surface methodology (rsm) was applied for modeling and optimization of the percentage of ash and pyrite sulphur removal from bitumen. the effects of five parameters namely the amounts of collector and frother agents, particle size, wash water rate and feed...

Background. Due to an increasing number of liver surgery, the problems using secure hemostatic techniques during its resection are still relevant and require further study. Objective. To determine optimal technique local hemostasis based on a comparative morphological assessment wound. Material methods. The study was performed 30 outbred white rats with examination biological material 7th 21st ...